Fluid motors



March 22, 1960 A. FEROY I 3 3 ooooooooo RS United States Patent FLUID MOTORS Arne Feroy, Auburn, Wash., assignor to Hydraulic Hoist Corporation, Auburn, Wash., a corporation of Washington Application February 17, 1958, Serial No. 715,674

2 Claims. (Cl. 121-86) This invention relates to fluid motors and pumps of the balanced vane class. The principal object of the invention is to provide a simple and positive means for driving the vanes to maintain seal and prevent leakage.

In oil motors and pumps of the balanced vanes class, it is necessary that the vanes follow the contour of the rotor chamber at all times, yet the oil pressures and centrifugal forces acting on the vanes are sometimes insufiicient to maintain the vanes in operable contact with the chamber wall. This difiiculty is especially troublesome in oil motors of this class. Moreover hydraulic motors ordinarily have high pressures underneath all vanes. An object of the invention is to provide the mechanical vane-driving mechanism in the midplane of the rotor so that the ports in the housing may be located to relieve the pressure underneath the vanes while they are moving toward the axis, thereby eliminating friction.

Other objects are to provide an oil motor or pump of simple and durable construction, operable with balanced pressures, and of few and simple parts of easy manufacture.

These and other objects of the invention will be apparent from the following specification in connection with the drawings, in which:

Fig. 1 is a longitudinal sectional view of the invention;

Fig. 2 is a transverse sectional view taken on the line 2-2 of Fig. 1;

Fig. 3 is a transverse sectional View taken on the line 3-3 of Fig. 1;

Fig. 4 is an enlarged view of one of the vanes and a portion of one of the vane-actuating pushrods and cushion springs.

Referring to the drawings, the casing of the oil motor or pump consists of end plates and shell 11, the three parts held together by capscrews 12. Shell 11 contains the pumping chamber with its wall 15. Oil may enter and leave the pumping chamber through ports 16 and passages 18.

Pump shaft 20 is mounted in journal bearings 19 in end plates 10. Splined to shaft 20 is a two-part rotor 23 and 22, held together by capscrews 21.

In the embodiment shown, twelve vanes 24 are slidable in twelve radial slots 25 in rotor 22--23, the slots'being thirty degrees apart. In the inner face of each of the rotor parts 23 and 22, three arcuate grooves are provided. Each arcuate groove slidably contains a ring are pushrod 30 operably connecting a pair of vanes 24 ninety degrees apart. Cushion springs 31 and 32 are provided to 2,929,365; Patented Mar. 22, 1960 2 compensate for any inaccuracies in construction and for wear.

Pumping chamber wall 15 is shaped so that it forces the vane 24 to more inwardly in its slot 25 as the vane 24 that is ninety degrees away (and connected to it by pushrod 30) is moving outwardly in its slot 25. Thus in operation all the .vanes are positively actuated and maintained at all times in running contact with the pumping chamber wall 15.

Having thus described the invention it is clear that the objects as stated have been attained in a simple and practical manner. While a particular embodiment of the invention has been shown and described, it is understood that changes may be made in the construction and in the arrangement of the various parts without departing from the spirit or scope of the invention as expressed in the following claims.

I claim: V

1. In a fluid motor of the balanced vane class, a casing, an oval working chamber in said casing, inlet and outlet ports and passages in said casing, a cylindrical twopart rotor split on its midplane perpendicular to the axis of the rotor and coaxially operable in said casing, twelve substantially radial slots in said rotor, twelve vanes operable in said slots, a set of three arcuate grooves formed in each inner face of said two-part rotor the grooves in one part crossing the grooves in the other, six ring are pushrods slidable in said grooves each operably connecting two of said vanes whereby one of said vanes alternately drives and is driven by the other, and cushion springs between the ends of said pushrods and said vanes, the various parts so constructed and arranged that all vanes are positively driven into and out of said slots and maintained in running contact with the inner wall of said working chamber.

2. In a fluid motor of the balanced vane class, a casing, an oval working chamber in said casing, inlet and outlet ports and passages in said casing, a cylindrical two-part rotor split on its transverse midplane and 00- I axially operable in said casing, an even number of substantially radial slots in said rotor, a vane operable in each of said slots, a set of arcuate grooves formed in the inner face of each of the two parts of said rotor the grooves of one part crossing the grooves in the other, each groove connecting the bottom of one said slots to the bottom of another, and ring are pushrods slidable in said grooves each pushrod operably connecting two of said vanes whereby one of said vanes alternately drives and is driven by the other, the vanes maintained in running contact with the inner wall of said working chamber.

References Cited in the file of this patent UNITED STATES PATENTS 993,648 Calkins May 30, 1911 1,334,906 Keith Mar. 23, 1920 9 1,582,922. Freud May 4, 1926 1,686,569 McMillan Oct. 9, 1928 2,569,185 McKibben et al. Sept. 25, 1951 2,641,193 Klessig June 9, 1953 2,641,194 Jones et al June 9, 1953 

